Editor's Note: Green and red arrows refer to intraday stock price movement.NEW YORK ( TheStreet) -- CHANGE IN RATINGS Advanced Micro ( AMD) upgraded at Sterne Agee from Neutral to Buy. $15 price target. Market share has likely bottomed out. Discovery ( DISCA) downgraded at Goldman from Neutral to Sell, Goldman Sachs said. $41 price target. Company is facing difficult comparisons. Eagle Materials ( EXP) downgraded at Jefferies from Underperform to Hold, Jefferies said. Valuation call, based on a $24 price target. IHS ( IHS) downgraded at Morgan Stanley to Equal-weight, Morgan Stanley said. Valuation call, as the stock is up 60% over the past year. Masco ( MAS) rated new Buy at Citigroup. $18 price target. Company should benefit from increased housing starts. Masimo ( MASI) downgraded at Citigroup from Hold to Sell, Citigroup said. Valuation call, based on a $28 price target. Plum Creek ( PCL) downgraded at UBS from Neutral to Sell, UBS said. $37 price target. Valuation call. Plum Creek ( PCL) numbers boosted at Goldman. Shares of PCL now seen reaching $42, according to Goldman Sachs. Estimates also upped, as the company is leveraged to a housing recovery. Neutral rating. Scripps Networks ( SNI) downgraded at Goldman from Neutral to Sell, Scripps Networks said. Company is facing weaker TV ratings. $47 price target. Valero Energy ( VLO) upgraded at Oppenheimer from Perform to Outperform, Oppenheimer said. $32 price target. Stock is trading at a 20% discount to its peers.